Grissom is called to the scene when a poultry processing plant employee is found dead in an electric stun bath that is used to electrocute chickens. The team is shocked to discover a mini-replica of the crime scene, a calling-card similar to the replicas found at two other homocides. Meanwhile, the team looks in to the death of a man and an woman who were found stuck in cement at a construction site as well as the death of an elderly Russian woman.

Recap

Ernie Dell: Look into the mouth of a person and you'll find lies, wriggling like maggots, ready to sprout wings.

Cultural References

Title: Loco Motives

A Locomotive is the driving force, or engine, of a train. The term "loco" is an english-spanish bastardization used to refer to someone insane or out of control, usually extremely so. At the same time, one's "motives" refer to ones reason for acting a certain way. Hence the title refers to a series of actions driven by insane motivations.